An idea is to hang curtains on the walls so that you can slide them around to different spots on the wall to change the acoustics.
Just buy longer rods as if each wall contained a large window. You can use different thickness fabric to see how it effects to sound. You can also use multiple panels on the same rod.
Another idea I have seen are tapestries, but that cost a lot more.
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Gibson J-45
Martin D18
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